Samsung Washer Error Code Hot&Medium LED Flash

The Hot&Medium LED Flash code indicates a fault with the washing heater thermistor, which is the temperature sensor located in the tub. The error is triggered when the control board detects a contact problem, a disconnected or incorrectly connected connector, a damaged sensor, or an overheating condition between 100 and 150 degrees Celsius caused by the heater running without water. The control board monitors thermistor resistance and flags this code when the reading deviates from the expected value of approximately 47 kilohms at 25 degrees Celsius.

No, you should not run the washer while this error is displayed. One of the causes is a dry heater condition where the heating element runs without water, which can reach temperatures between 100 and 150 degrees Celsius and potentially damage the appliance. Continuing to operate the machine before resolving the fault could worsen the damage or create a safety hazard.

If the fix is simply reseating a loose connector, there may be no parts cost at all. Replacing a faulty thermistor typically involves a parts cost in the range of $15 to $50 depending on the specific model. If a technician is needed for diagnosis and repair, total service costs generally fall in the range of $100 to $250, though this varies by region and the extent of any additional damage found during inspection.

In many cases, yes. Start by unplugging the washer and inspecting the thermistor connector at CN10 to make sure it is fully connected and free of corrosion. If you have a multimeter, measure resistance across pins 3 and 9 of CN10 and compare the result to the expected 47 kilohms at room temperature. If the connector is secure and the resistance is within range, the issue may require a technician to inspect the control board or wiring harness more thoroughly.

A reset may temporarily clear the code, but it will return if the underlying fault is not corrected. If the thermistor is physically disconnected, damaged, or the wiring harness has a break, the control board will detect the fault again as soon as the machine attempts a heated wash cycle. Address the root cause before relying on a reset to restore normal operation.